Combined rock-magnetic and geochemical characterization of Angangueo mining district, central Mexico

Results of a combined rock-magnetic and geochemical investigation carried out at Angangueo mining district are presented. The different thickness and color of layers observed in field are also sketched from the magnetic susceptibility vertical ground profile accomplished. Additionally, an area with enhanced magnetic susceptibility values is clearly outlined from a radial survey on the top of one of the biggest tailing. The internal differentiation of the tailing was also supported by a full set of laboratory rock-magnetic and physical–chemical parameters. Geochemical results of matched samples reveal a complex relationship along the profile between some heavy metal concentrations (i.e., Cu and Pb) and magnetic susceptibility, never reported in mining wastes nor in environmental studies. Contrary to environmental investigations of topsoils, magnetic susceptibility enhancements zones in a tailing do not correspond necessarily to more heavy metal-contaminated zones. These outcomes evidence the intricate nature of mining wastes and the need for a better and intensive investigation of these barely studied objects.